A158910 First Differences of A061240.

18, 18, 18, 54, 18, 18, 18, 72, 18, 36, 18, 36, 36, 18, 18, 72, 18, 54, 36, 18, 36, 90, 18, 36, 90, 54, 36, 36, 18, 18, 54, 90, 36, 54, 18, 18, 54, 36, 18, 54, 18, 54, 18, 36, 90, 36, 54, 36, 54, 36, 18, 18, 54, 36, 72, 18, 108, 36, 36, 72, 18, 18, 126, 36, 54, 54, 54, 36, 126

Offset: 1

Author

Paul Curtz, Mar 30 2009

Keywords

• nonn
• less

Comments

Since A061240 contains prime numbers of the form 9k+5, k even, all numbers here are multiples of 18.

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A008600.

Programs

Mathematica

Differences[Select[Prime[Range[500]],Mod[#,9]==5&]] (* Harvey P. Dale, May 19 2018 *)

Extensions

Edited and extended by R. J. Mathar, Apr 03 2009